Questions on Cisco ACE troubleshooting

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- How can an ACE administrator establish to the application team that the hit on VIP has been successfully forwarded to the client. Is a hit count enough a proof for that.

- Can dropped conn count go up because of any application failure/misconfiguration

- Where can I find the detailed breakdown to interpret the show capture output.

- How long does the ACE wait if the application does not respond to the hit on VIP.

- How can I simuate http get / head method against a web service. telnet IP <port #> only confirms the service active state and not correct functioning of the web service. That's because in my case, SHOW PROBE is showing as failed yet I am able to telnet the service. Probe is set for 30 seconds.

- Could you please give a breakdown of the SHOW CONN display

- What 'show' comamnds should an ACE administrator master, to facilitate speedy troubleshooting.

- Where can I find the detailed breakdown to interpret the show capture output.

Instead of displaying it locally use "copy capture disk0:syed.cap" and use wireshark to see these packets

- How long does the ACE wait if the application does not respond to the hit on VIP.

The time (in seconds) that ACE waits for SYN ACK is a value of "Open timeout".Open tiemout is configured under probe definition using "open " command.

- How can I simuate http get / head method against a web service. telnet IP only confirms the service active state and not correct functioning of the web service. That's because in my case, SHOW PROBE is showing as failed yet I am able to telnet the service. Probe is set for 30 seconds.

We used to have this functionality in CSS but from ACE you cannot do that.

But show probe detial command give you the reason of the las probe failure for example

"Last disconnect err: Host Unreachable, no route to destination"

or

"Last disconnect err: Connection reset by server"

or

""Last disconnect err:Server open timeout (No Sync Ack)" etc...

- Could you please give a breakdown of the SHOW CONN display

conn id-> Id of he connection. you can use (sh np 1 me-stats "-c â) to get more details about connection

np --> Ace has two processors np1 & np2. This column tells which processor is handling this connection

- Where can I find the detailed breakdown to interpret the show capture output.

Instead of displaying it locally use "copy capture disk0:syed.cap" and use wireshark to see these packets

- How long does the ACE wait if the application does not respond to the hit on VIP.

The time (in seconds) that ACE waits for SYN ACK is a value of "Open timeout".Open tiemout is configured under probe definition using "open " command.

- How can I simuate http get / head method against a web service. telnet IP only confirms the service active state and not correct functioning of the web service. That's because in my case, SHOW PROBE is showing as failed yet I am able to telnet the service. Probe is set for 30 seconds.

We used to have this functionality in CSS but from ACE you cannot do that.

But show probe detial command give you the reason of the las probe failure for example

"Last disconnect err: Host Unreachable, no route to destination"

or

"Last disconnect err: Connection reset by server"

or

""Last disconnect err:Server open timeout (No Sync Ack)" etc...

- Could you please give a breakdown of the SHOW CONN display

conn id-> Id of he connection. you can use (sh np 1 me-stats "-c â) to get more details about connection

np --> Ace has two processors np1 & np2. This column tells which processor is handling this connection